The offer still stands, do all measurements post them here and I can design and upload a .stl file and the OpenSCAD code here and to thingiverse.com
Review with a 3D model viewer and post any edits that need to be made.
I still am not sure how well it would turn out though, FDM printing, the kind which squirts layers of plastic is likely not the best way to make a cover but you could get a printing service to do it for you and see.